检索结果-南通市图书馆

International Journal of Communications, Network and System Sciences 2015年第5期8卷 118-129页

作者： Jafar Alqatawna Hossam Faris khalid Jaradat Malek Al-Zewairi omar Adwan King Abdullah II School for Information Technology The University of Jordan Amman Jordan

Spam is no longer just commercial unsolicited email messages that waste our time, it consumes network traffic and mail servers’ storage. Furthermore, spam has become a major component of several attack vectors including attacks such as phishing, cross-site scripting, cross-site request forgery and malware infection. Statistics show that the amount of spam containing malicious contents increased compared to the one advertising legitimate products and services. In this paper, the issue of spam detection is investigated with the aim to develop an efficient method to identify spam email based on the analysis of the content of email messages. We identify a set of features that have a considerable number of malicious related features. Our goal is to study the effect of these features in helping the classical classifiers in identifying spam emails. To make the problem more challenging, we developed spam classification models based on imbalanced data where spam emails form the rare class with only 16.5% of the total emails. Different metrics were utilized in the evaluation of the developed models. Results show noticeable improvement of spam classification models when trained by dataset that includes malicious related features.

关键词： Spam E-Mail Malicious Spam Spam Detection Spam Features Security Mechanism Data Mining

Towards hepatitis C virus elimination:Egyptian experience,achievements and limitations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2018年第38期24卷 4330-4340页

作者： Dalia Omran Mohamed Alboraie Rania A Zayed Mohamed-Naguib Wifi Mervat Naguib Mohamed Eltabbakh Mohamed Abdellah Ahmed Fouad Sherief Sahar Maklad Heba Hamdy Eldemellawy omar khalid Saad Doaa Mohamed Khamiss Mohamed El Kassas Department of Endemic Medicine and Hepatology Faculty of MedicineCairo UniversityCairo 11651Egypt Department of Endemic Medicine Faculty of MedicineHelwan UniversityCairo 11599Egypt Department of Internal Medicine Al-Azhar UniversityCairo 11651Egypt Department of Clinical and Chemical Pathology Faculty of MedicineCairo UniversityCairo 11651Egypt Department of Internal Medicine Faculty of MedicineCairo UniversityCairo 11599Egypt Department of Tropical Medicine Faculty of MedicineAin Shams UniversityCairo 11566Egypt National Hepatology and Tropical Medicine Research Institute Cairo 11599Egypt Department of Internal Medicine Faculty of MedicineBeni-Suef UniversityBeni-Suef 62511Egypt Faculty of Medicine Ain Shams UniversityCairo 11566Egypt Department of Clinical and Chemical Pathology El-monera hospitalMinistry of HealthCairo 11562Egypt

Worldwide, more than one million people die each year from hepatitis C virus(HCV) related diseases, and over 300 million people are chronically infected with hepatitis B or C. Egypt used to be on the top of the countries with heavy HCV burden. Some countries are making advances in elimination of HCV, yet multiple factors preventing progress; remain for the majority. These factors include lack of global funding sources for treatment, late diagnosis, poor data, and inadequate screening. Treatment of HCV in Egypt has become one of the top national priorities since 2007. Egypt started a national treatment program intending to provide cure for Egyptian HCV-infected patients. Mass HCV treatment program had started using Pegylated interferon and ribavirin between 2007 and 2014. Yet, with the development of highly-effective direct acting antivirals(DAAs) for HCV, elimination of viral hepatitis has become a real possibility. The Egyptian National Committee for the Control of Viral Hepatitis did its best to provide Egyptian HCV patients with DAAs. Egypt adopted a strategy that represents a model of care that could help other countries with high HCV prevalence rate in their battle against HCV. This review covers the effects of HCV management in Egyptian real life settings and the outcome of different treatment protocols. Also, it deals with the current and future strategies for HCV prevention and screening as well as the challenges facing HCV elimination and the prospect of future eradication of HCV.

关键词： Hepatitis C virus Egypt Direct acting antivirals screening elimination Limitations

Delay Compensation Observer with Sliding Mode Controller for Rotary Electro-hydraulic Servo System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2021年第S1期38卷 49-56页

作者： ZAKARYA omar khalid Hussein WANG Xingsong ORELAJA Olusyi Adwale School of Mechanical Engineering Southeast UniversityNanjing 211189P.R.China Faculty of Engineering Sana’a UniversitySanaaYemen

The hip’s lower limb exoskeleton essential and most important function is to support human’s payload as well as to enhance and assist human’s motion. It utilizes an electro-hydraulic servo manipulator which is required to achieve precise trajectory tracking and positioning operations. Nevertheless,these tasks require precise and robust control,which is very difficult to attain due to the inherent nonlinear dynamic behavior of the electro-hydraulic system caused by flow-pressure characteristics and fluid volume control variations of the servo valve. The sliding mode controller(SMC)is a widely used nonlinear robust controller,yet uncertainties and delay in the output degrade the closed-loop system performance and cause system instability. This work proposes a robust controller scheme that counts for the output delay and the inherent parameter uncertainties. Namely,a sliding mode controller enhanced by time-delay compensating observer for a typical electro-hydraulic servo system is adapted. SMC is utilized for its robustness against servo system parameters’ uncertainty whereas a time-delay observer estimates the variable states of the controller(velocity and acceleration). The main contribution of this paper is improving on the closed loop performance of the electro hydraulic servo system and mitigating the delay time effects. Simulation results prove the robustness of this controller,which forces the position to track the desired path regardless of the changes of the amount of transport delay of the system’s states. The performance of the proposed controller is validated by repeating the simulation analysis while varying the amount of delay time.

关键词： sliding mode controller rotary electro-hydraulic servo system delay compensating observer transport delay

Design, Synthesis and Pharmacological Evaluation of New Nonsteroidal Anti-Inflammatory Derived from 3-Aminobenzothieno[2,3-<i>d</i>]pyrimidines

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Organic Chemistry 2013年第2期3卷 110-118页

作者： Hend Nagah Hafez omar khalid Al-Duaij Abdel-Rhman Barakat A. El-Gazzar Chemistry Department Faculty of Science Al-Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh KSA Photochemistry Department National Research Centre Cairo Egypt

During the last few years, condensed thienopyrimidine derivatives have received considerable attention. The therapeutic importance of thienopyrimidines prompted us to synthesize some of spiro(benzothieno[2,3-d]pyrimidine-4-one) derivatives. Some of the novel benzothino-pyrimidine derivatives 3a, 9b, 10b, 11a, 11b, and 11c showed considerable potent anti-inflammatory and analgesic activity of superior G.I.T. safety profile in experimental rats in comparing to indomethacin and tramadol as reference drugs.

关键词： Spirobenzothienopyrimidine Triazolopyrimidine Pyrazolopyrimidine Analgesic Anti-inflammatory Ulcerogenic Effect

The Awareness of Keratoconus among General Population in Saudi Arabia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Ophthalmology 2021年第1期11卷 49-59页

作者： Rahaf Mohammed Alruwaili Abeer Surihan Alharbi omar Ali Alghamdi Yahya Abdulrahman Alyahya Nouf Mohammed Albalawi Sameer Sohail Alostaz omar Ahmed Asiri khalid Alarfaj College of Medicine Jouf University Sakaka Saudi Arabia Ophthalmology Department Ohud Hospital Madina Saudi Arabia Ophthalmology Department King Fahad Hospital Albaha Saudi Arabia Ophthalmology Department Burydah Central Hospital Qassim Saudi Arabia College of Medicine Tabuk University Tabuk Saudi Arabia Batterjee Medical College Jeddah Saudi Arabia Faculty of Medicine Taif University Taif Saudi Arabia Ophthalmology Department Imam Abdulrahman Bin Faisal University Dammam Saudi Arabia

Introduction: Keratoconus (KCN) is one of the degenerative corneal disorders, which causes impairment in normal visual acuity with a higher prevalence in Saudi Arabia. The study aimed to assess the awareness and knowledge regarding KCN, its risk factors, and management among the Saudi population. Materials and Methods: A survey was conducted using a pre-tested and validated questionnaire distributed through online platforms. A mixture of convenience and snowball sampling techniques was adopted for sample collection. Our analysis included a final sample size of 837 participant responses. The questionnaire had items related to sociodemographic characteristics (5 items), knowledge (10 items), and source of information (1 item). The mean knowledge scores were calculated and categorized (good, fair, and poor) to assess each participant’s knowledge. Pearson’s chi-square test was used to determine the statistical association between categorical variables. Results: The mean knowledge score was found to be 4.12 ± 2.6, and 67.5% of the participants showed “poor” scores. There was no statistically significant association of knowledge scores observed with any of the sociodemographic details. It was agreed by 76% and 42.5% that genetic predisposition and chronic eye inflammation could predispose to KCN. Only 38.1% (n = 157) agreed that KCN could be treated with optical glasses or contact lenses in the initial stages. Conclusion: The knowledge regarding KCN was not satisfactory among our study population. There is a need to create an increased level of awareness for KCN. Health awareness programs and community campaigns should be organized to raise awareness regarding KCN and better eye health care utilization.

关键词： Ophthalmology Inflammation Keratoconus Blindness

Functional Nonparametric Predictions in Food Industry Using Near-Infrared Spectroscopy Measurement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第3期74卷 6307-6319页

作者： Ibrahim M.Almanjahie omar Fetitah Mohammed Kadi Attouch Tawfik Benchikh Department of Mathematics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Statistical Research and Studies Support Unit King Khalid UniversityAbha62529Saudi Arabia Laboratory of Statistics and Stochastic Processes University of Djillali Liabes BP 89 Sidi Bel Abbes22000Algeria Medical Faculty Djillali Liabes University BP 89Sidi Bel Abbes22000Algeria

Functional statistics is a new technique for dealing with data thatcan be viewed as curves or images. Parallel to this approach, the Near-InfraredReflectance (NIR) spectroscopymethodology has been used in modern chemistryas a rapid, low-cost, and exact means of assessing an object’s chemicalproperties. In this research, we investigate the quality of corn and cookiedough by analyzing the spectroscopic technique using certain cutting-edgestatistical models. By analyzing spectral data and applying functional modelsto it, we could predict the chemical components of corn and cookie *** Functional Classical Estimation (KFCE), Kernel Functional QuantileEstimation (KFQE), Kernel Functional Expectile Estimation (KFEE),Semi-Partial Linear Functional Classical Estimation (SPLFCE), Semi-PartialLinear Functional Quantile Estimation (SPLFQE), and Semi-Partial LinearFunctional Expectile Estimation (SPLFEE) are models used to accuratelyestimate the different quantities present in Corn and Cookie dough. Theselection of these functional models is based on their ability to constructa forecast region with a high level of confidence. We demonstrate that theconsidered models outperform traditional models such as the partial leastsquaresregression and the principal component regression in terms of predictionaccuracy. Furthermore, we show that the proposed models are morerobust than competing models such as SPLFQE and SPLFEE in the sensethat data heterogeneity has no effect on their efficiency.

关键词： Functional statistics NIR chemical component kernel estimation

Calcified Abdominal Pregnancy with Five Years of Evolution (Lithopedion): A Case Report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2016年第8期6卷 515-519页

作者： Nafisa A. Mohamed Ikram A. Hajji Salah A. omar khalid S. Kalib Abdirizak H. Ali Department of Obstetrics and Gynecology Benadir Hospital Mogadishu Somalia

Lithopedion is a rare phenomenon resulting from an extra-uterine pregnancy that advances to fetal demise and calcification and there are less than 300 cases reported in 400 years of medical literature. This rare condition was first described by a surgeon of the Arabic era of medicine in the 10th century. This case report is a 26-year-old, multiparous woman who had presented a lower abdominal pain for long time and she had never attended in pre-natal clinic. She came to our hospital with pain and tumoral mass in infra-umbilical area and then we referred to radiology center, after that ultrasound examination of radiology center demonstrated an extra-uterine abdominal 30-week pregnancy measuring the femoral length, this for first diagnosis of radiology center. After laparotomy was performed we met an oval shaped mass that attached the omentum in peritoneal cavity and this mass was a fetus retention of 5 years without calcified ovular membranes but the fetus was calcified so this type is called lithopedion that describes according to the Kuechenmeister classification in 1881. She made good post-operative recovery after extraction the stone baby.

关键词： Abdominal Pregnancy Lithopedion

Industrial Food Quality Analysis Using New k-Nearest-Neighbour methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第5期67卷 2681-2694页

作者： omar Fetitah Ibrahim M.Almanjahie Mohammed Kadi Attouch Salah Khardani Laboratory of Statistics and Stochastic Processes University of Djillali LiabesSidi Bel Abbes22000Algeria Department of Mathematics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Statistical Research and Studies Support Unit King Khalid UniversityAbha62529Saudi Arabia Facultédes sciences de Tunis Laboratoire des Réseaux Intelligents et NanotechnologieTunisTunisia

The problem of predicting continuous scalar outcomes from functional predictors has received high levels of interest in recent years in many fields,especially in the food *** k-nearest neighbor(k-NN)method of Near-Infrared Reflectance(NIR)analysis is practical,relatively easy to implement,and becoming one of the most popular methods for conducting food quality based on NIR *** k-NN is often named k nearest neighbor classifier when it is used for classifying categorical variables,while it is called k-nearest neighbor regression when it is applied for predicting noncategorical *** objective of this paper is to use the functional Near-Infrared Reflectance(NIR)spectroscopy approach to predict some chemical components with some modern statistical models based on the kernel and k-Nearest Neighbour *** this paper,three NIR spectroscopy datasets are used as examples,namely Cookie dough,sugar,and tecator ***,we propose three models for this kind of data which are Functional Nonparametric Regression,Functional Robust Regression,and Functional Relative Error Regression,with both kernel and k-NN approaches to compare between *** experimental result shows the higher efficiency of k-NN predictor over the kernel *** predictive power of the k-NN method was compared with that of the kernel method,and several real data sets were used to determine the predictive power of both methods.

关键词： Functional data analysis classical regression robust regression relative error regression kernel method k-NN method near-infrared spectroscopy

Primary Anorectal Melanomas Interest of Targeting C-KIT in Two Cases from a Series of 11 Patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Cancer Therapy 2014年第3期5卷 225-230页

作者： Karima Oualla Nawfel Mellas Fatimazahra El’mrabet Samia Arifi Afaf Amarti khalid Ait Taleb Siham Tizniti omar Elmesbahi Department of Medical Oncology Hassan II University Hospital Fez Morocco Department of Pathology Hassan II University Hospital Fez Morocco Department of Radiology Hassan II University Hospital Fez Morocco Department of Visceral Surgery Hassan II University Hospital Fez Morocco

Background: The anorectal location of melanomas is extremely rare (1% - 3% of all melanomas), and the prognosis remains poor because of the aggressiveness and the high metastatic potential of those tumors. The discovery that the KIT oncogene may be aberrantly activated in a subset of patients with anorectal melanoma creates a realm of possibility for the development of targeted molecular therapy. Aim: to show the epidemiologic, clinico-radiological, histological features and treatment management especially in patients with over-expression of C-KIT treated by Imatinib. Methods: It is a retrospective study conducted in the department of medical oncology at Hassan II University Hospital between January 2007 and January 2012, including all patients with histologically proven melanoma of the anorectal area. Results: 11 cases were collected, with slight female predominance. Nine patients were metastatic at the moment of diagnosis, and only two with local stage, but evolution was marked by local and distant recurrence less than 12 months after abdo-minoperineal resection. First line of chemotherapy was based mainly on paclitaxel, carboplatine and dacarbazine. Response was modest with only 3 partial responses, 4 patients with disease stability, and 4 patients with disease progression. Two patients, with over expression of C-KIT, received Imatinib as second line of treatment with significant improvement of symptoms and radiological response reaching 50%. Seven patients died with a median survival of 11 months from diagnosis to the date of death. Conclusion: Primary anorectal melanomas are very rare, with high aggressiveness and poor prognosis. Treatment management is still a big challenge given to the modest efficacy of conventional chemotherapy. Better understanding of carcinogenesis and signaling pathways will allow development of new targeted therapies.

关键词： Melanoma Anorectal Area Surgery Chemotherapy C-KIT Imatinib

Tympanometry Comparison of Diabetic Type I and Diabetic Type II Rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Diabetes Mellitus 2023年第1期13卷 58-67页

作者： Susan Amin Ahmed Alaradi Ahmed Alekri Ali Alaysreen Ammar Kheyami Hasan Baksh khalid Nazzal Abdullah Altamimi omar Alhamdan Amer Kamal School of Medicine Royal College of Surgeons in Ireland (RCSI-Bahrain) Busaiteen Bahrain Department of Physiology Arabian Gulf University (AGU) Manama Bahrain

Hearing impairment affects over two-thirds of adults with diabetes. We investigated whether rat models of type 1 and type 11 diabetes display impaired auditory function. Tympanometry measurements were conducted in Sprague-Dawley rats (control, n = 20), streptozotocin-induced type I diabetic Sprague-Dawley rats (n = 20) at 42 - 56 days old;Zucker rats (Hos: ZFDM-Lean (fa/+, n = 20) and Zucker Type 2 Diabetic rats (ZFDM (Hos: ZFDM-fa/fa);n = 20)), 90 days old. All rats were male. Control animals had normal type A tympanograms. Tweny one (75%) of the tympanic membranes in the diabetic type I group produced abnormal tympanograms: 46% were type B, 28% had no peak found, and 1% were type C. The ear canal measurements were lower in the left ear in type I mice (0.19 ± 0.07) and higher in the left ear for type II mice (0.23 ± 0.15 ml) compared to the controls of 0.39 ± 0.14 ml) and (0.2 ± 0.12 ml) respectively (P < 0.0001). The compliances for the right ear and left ear were lower for the type II diabetic group (0.18 ± 0.05 ml) and (0.18 ± 0.05 ml) compared to the control group (0.28 ± 0.19 ml) and (0.28 ± 0.49 ml) (P < 0.0001) respectively. In conclusion, control rats exhibited type A tympanograms with a highly functional middle ear system. Diabetic type I rats (n = 20) mostly exhibited type B tympanograms with a less compliant middle ear system. Compliance was reduced in the diabetic type I and II animals compared to the control. Future studies should utilise histological methods alongside tympanometry. Sections of the middle ear could be used to analyze ossicle size and confirm size differences. This information would be useful in avenues for treatment options for hearing loss in diabetes.

关键词： Diabetes Tympanometry Auditory Function Compliance Ear Canal